Thermoguard Thermocoat WO

Non Hazardous
A low-odour, water-based coating for use within a 90 minute fire protection system on structural steel and cast iron.
Available in 2.5, 5 and 20 Kg in White
From £87.72 £73.10
In stock
Only %1 left
Product Description

Thermoguard Thermocoat WO is a low-odour, water-based coating for use within a water based fire protection system on structural steel and cast iron.

Best Uses

Thermoguard Thermocoat WO is optimised to protect structural steel hollow posts from fire for up to 90 minutes. It is a water-based intumescent paint system providing fire resistance to structural steel and cast iron of up to 90 minutes with a minimum number of coats. A compatible decorative overcoat system ensures the system will enhance the building’s architectural and design features. Benefits from being environmentally friendly.

How it works: The heat of a fire triggers a catalytic reaction, causing the expansion of an insulating char layer up to 50 times the paint thickness. This layer keeps the steel below its critical temperature, thus maintaining the structural integrity of the building.

Thermocoat WO can be overcoated with the following Thermoguard topcoats - Thermoguard Flame Retardant Gloss, Thermoguard Flame Retardant Eggshell, WB satin, WB matt in BS 4800 & RAL colours.


Steel and cast iron should be free from rust and millscale and primed with Thermoguard Steel Fire Paint Primer to 75 microns DFT ( or alternative good quality anti-corrosive primer compatible with intumescent paints) in accordance with manufacturer’s instructions. Treat galvanised surfaces with T wash / mordant solution & prime with zinc phosphate or other primer for steel.

Ensure maximum relative humidity 80%, with a minimum ambient temperature 4°C and minimum steel temperature 3°C above dew point.

Apply Thermocoat WO by brush, roller or airless spray. To achieve the best finish in the shortest time, spray application is recommended. Prior to application the contractor should contact Promain’s Technical Department and obtain a basecoat application schedule. Ensure to test thickness with a Wet Film Thickness Gauge.

  • Maximum wet film thickness per brush coat – 800 microns
  • Maximum wet film thickness per spray coat – 1400 microns

Topcoat Recommendations:

IMPORTANT INTUMESCENT PRODUCT NOTE: Always contact Promain’s technical team prior to purchase to obtain a tailored project specification and the advice necessary. The information displayed on this website should only be used as a guide. Promain UK Limited will not be held liable for any resulting damage to property, human life or monetary costs incurred due to incorrect specification, preparation, application or maintenance that has occurred due to negligence by either the purchaser or applicator. This includes your failure to have contacted us to obtain the relevant advice/specification.

Technical Details

Approvals and Certifications

  • Thermoguard issue a Certificate of Supply on request for each specified project for insurance, Fire and Building Control Authority and Client Records
  • Product performance assessment is based upon UKAS/ EGOLF Fire Test Laboratory Certification to BS 476 Part 21 - Fire Resistance to load bearing elements of structures

Technical Info

Components: Single Pack
Type: Water based
Stock Colours: White
Tintable: No
Volume Solids:  
Suitable Substrates: Structural Steel, Cast Iron
Application Method: Brush, Roller, Airless Spray
Theoretical Coverage:

Prior to application the contractor should contact Promain’s Technical Department and obtain a basecoat application schedule or follow on can guidance.

Do not overspread as this will compromise the system and result in non-compliance and a failure to be certified.

Surface Dry: Approx 2 hours at 20°C
  • Minimum of 4 hours at 20°C if using brush application
  • Minimum of 10 hours at 20°C if using spray application
  • Overcoating with Thermoguard Flame Retardant Eggshell / Gloss: Minimum 48 hours at 20°C
Fully Cured:  
Cleaner / Thinner: Clean up with Water
Shelf Life: See container
Packaging: Available in 2.5, 5 and 20 Kg

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